Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/60r15 vs 175/55r15 Tire Comparison Side By Side
  165/60-15 175/55-15 Difference
Diameter inches (mm) 22.8 (579) 22.58 (573.5) -0.22 (-5.5) -0.9%
Width inches (mm) 6.5 (165) 6.89 (175) 0.39 (10) 6.1%
Circum. inches (mm) 71.61 (1818.98) 70.93 (1801.7) -0.68 (-17.28) -0.9%
Sidewall Height inches (mm) 3.9 (99) 3.79 (96.25) -0.11 (-2.75) -2.8%
Revolutions per mile (km) 884.75 (549.76) 893.23 (555.03) 8.48 (5.27) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.81 mph (31.88 km/h)
25 mph (40.23 km/h)24.76 mph (39.85 km/h)
30 mph (48.28 km/h)29.72 mph (47.82 km/h)
35 mph (56.33 km/h)34.67 mph (55.79 km/h)
40 mph (64.37 km/h)39.62 mph (63.76 km/h)
45 mph (72.42 km/h)44.57 mph (71.73 km/h)
50 mph (80.47 km/h)49.53 mph (79.7 km/h)
55 mph (88.51 km/h)54.48 mph (87.67 km/h)
60 mph (96.56 km/h)59.43 mph (95.64 km/h)
65 mph (104.61 km/h)64.38 mph (103.61 km/h)
70 mph (112.65 km/h)69.34 mph (111.58 km/h)
75 mph (120.7 km/h)74.29 mph (119.55 km/h)
80 mph (128.75 km/h)79.24 mph (127.52 km/h)
85 mph (136.79 km/h)84.19 mph (135.5 km/h)
90 mph (144.84 km/h)89.15 mph (143.47 km/h)
95 mph (152.89 km/h)94.1 mph (151.44 km/h)
100 mph (160.93 km/h)99.05 mph (159.41 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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